public class Example4_10 {
    public static void main(String args[]) {
	Lader.下底 = 100 ;
	Lader laderOne = new Lader ();
	Lader laderTwo = new Lader ();
	laderOne.设置上底(28);
	laderTwo.设置上底(66);
	System.out.println("laderOne的上底:"+laderOne.获取上底());
	System.out.println("laderOne的下底:"+laderOne.获取下底());
	System.out.println("laderTwo的上底:"+laderTwo.获取上底());
	System.out.println("laderTwo的下底:"+laderTwo.获取下底());
	}
}
